CVE-2026-32301: centrifugal centrifugo · Server-Side Request Forgery (SSRF)
Affects centrifugal centrifugoSource CVE Database V5
Not known to be exploited · CVSS 9.3 Critical : upgrade to 6.7.0 as a priority.
Data as of 30 Oct 2026, 11:52 UTC
Contested
Critical score, yet low EPSS after six months- EPSS
- 0.2% chance of exploitation in 30 days – higher than 18% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 6.7.0
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:NExploitation evidence
Disclosed: evidence found.
CVE published 12 Mar 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.
What to do
Upgrade centrifugo and centrifugal/centrifugo to 6.7.0.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| centrifugalcentrifugo | Affected
| Fixed in
|
GitHubcentrifugal/centrifugopkg:github/centrifugal/centrifugoOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
- Upgrade Centrifugo to version 6.7.0 or later, where this SSRF vulnerability is fixed.
- Avoid using dynamic template variables in JWKS endpoint URLs, especially those interpolated from untrusted JWT claims such as iss or aud.
- If dynamic JWKS URLs are necessary, implement strict validation and sanitization of JWT claims before interpolation to prevent injection of malicious values.
- Restrict outbound HTTP requests from Centrifugo servers via network-level controls such as firewall rules or egress filtering to limit access to only trusted JWKS endpoints.
- Monitor logs for unusual outbound HTTP requests from Centrifugo instances, which may indicate exploitation attempts.
- Employ network segmentation to isolate Centrifugo servers from sensitive internal resources to reduce SSRF impact.
- Conduct regular security assessments and penetration testing focusing on SSRF vectors in your environment.
- Educate developers and administrators about the risks of dynamic URL interpolation and secure JWT validation practices.
Description
CVE-2026-32301 is a critical Server-Side Request Forgery (SSRF) vulnerability in Centrifugo versions prior to 6.7.0. It arises when Centrifugo is configured with a dynamic JWKS endpoint URL that uses template variables such as {{tenant}}. An unauthenticated attacker can craft a malicious JWT with manipulated iss or aud claims, which are interpolated into the JWKS fetch URL before signature verification. This causes Centrifugo to make outbound HTTP requests to attacker-controlled destinations, potentially exposing internal network resources or enabling further attacks. The vulnerability has a CVSS score of 9.3, indicating high severity with critical impact on confidentiality. No known exploits are currently reported in the wild. The issue is fixed in version 6.